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What is a light bulb?

What is a light bulb? Here are some definitions.

Noun
  1. An evacuated glass bulb containing a metal filament which is heated by electrical resistance to produce light.
  2. (by extension) An article that resembles such a bulb and converts electricity to light by any process.
  3. (figuratively) Used in reference to the sudden arrival of a realization, an inspiration, an idea, or the like.
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Examples
An incandescent light bulb contains a thin wire filament that glows hot when an electric current is run through it.
As you know from replacing light bulbs, there is a large, thin, frosted glass envelope in the familiar light bulb shape.
Lewis Latimer, the son of runaway slaves, became an electrical engineer and invented an inexpensive process for making light bulb filaments.
You come out the other, and it's like a light bulb has flashed inside your head.
There's a light bulb glowing over my head that is brighter than the flaring of a sour gas well.
A regular incandescent light bulb relies on the fact that all bodies with a temperature greater than absolute zero emit radiation.

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